Guiding characteristics of an acoustic standing wave in a piezoelectric tube

摘要

Propagation of an He-Ne laser beam through a gas filled piezoelectric tube is used to characterize the guiding properties of a radially driven acoustic standing wave. Impedance matched driving at 1 MHz of the 5-cm-long piezotube yields radial density perturbations of 0.005 at 40 V driving voltage. The frequency spectrum of the cavity resonances is used to measure the damping of the standing wave due to shear viscosity in Ar. (C) 1998 American Institute of Physics. S0003-6951(98)00846-8. References: 11